Kim Kardashian and Kanye West's son, Saint West turns one year old

Saint West has celebrated his first birthday. Photo / Instagram

Saint West turned one-year-old yesterday. And the Kardashian/Jenner family was quick to take to social media to wish the little boy a happy first birthday.

Kim Kardashian's best friend Jonathan Cheban started the celebration in a post on her website kimkardashianwest.com with a gushing note to the only son of Kim and Kanye West.

Kim Kardashian, Kanye West with North West and Saint West in New York City. Photo / Getty

'I can't believe today is Saint's first birthday! One thing people may not know about me is that I'm obsessed with babies, LOL,' he wrote. 'In honor of his birthday, I convinced Kim to let me share some never-before-seen pics! Happy birthday, Saint!'

One of the two new images is of Saint grabbing the face of the Keeping Up With The Kardashians star as she tries to kiss him.

Like father like son, singer Kanye West and his son Saint West are seen walking in Soho. Photo / Getty

Family members chimed in as well. Khloe, 32, wrote on her site khloewithak.com: 'I can't believe how quickly time flies!

'Watching my little Saint grow this past year has been amazing. He's seriously such an angel and could not be more adorable. What a light he's been for our family!'

And Kendall, 21, wrote on her site kendallj.com: 'Saint, I can't believe it's been a year since you came into our lives! You're the sweetest addition to the fam. Even though you're still so young, you already have the most happy and amazing personality. I love you!'

View this post on Instagram

I can't believe this was one year ago today. Happy birthday my little Sainty.

A post shared by Kourtney Kardashian (@kourtneykardash) on Dec 5, 2016 at 12:13pm PST

Kourtney, 37, chimed in with a sweet message, posting on Instagram: 'I can't believe this was one year ago today. Happy birthday my little Sainty.'

Momager Kris Jenner, 61, also shared her note on Instagram: 'Happy birthday to our sweet angel, Saint!'

View this post on Instagram

Happy birthday to our sweet angel, Saint! #family #love #happybirthdaysaint #saintwest

A post shared by Kris Jenner (@krisjenner) on Dec 5, 2016 at 9:02am PST

She included the hashtags family and love.

Saint, who was born at Cedars-Sinai Medical Center in Los Angeles, has a sister, North West, aged three.